/usr/lib/x86_64-linux-gnu/libfontembed.so is in libfontembed-dev 1.8.3-2ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libfontembed.so.1.0.0
/usr/lib/x86_64-linux-gnu/libfontembed.so.1.0.0